Check $post->post_status directly in _update_posts_count_on_delete() for better performance.

props pento.
fixes #27952.
Built from https://develop.svn.wordpress.org/trunk@29667


git-svn-id: http://core.svn.wordpress.org/trunk@29441 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Simplify the code for calling refresh_blog_details() whenever 'blogname', 'siteurl', or 'post_count' option is updated.

props pento, nacin.
fixes #26410.
Built from https://develop.svn.wordpress.org/trunk@29668


git-svn-id: http://core.svn.wordpress.org/trunk@29442 1a063a9b-81f0-0310-95a4-ce76da25c4cd